require 'item_printer' module ItemListPrinter def self.to_string(items, item_printer = ItemPrinter) items.each_with_index.map { |item, index| item_printer.to_string(item, index + 1) }.join("\n") end def self.to_summary(items, keys, item_printer = ItemPrinter) items.each_with_index.map { |item, index| item_printer.to_summary(item, keys, index + 1) }.join("\n") end end